http://www.wdc.com/global/products/features/?id=7&language=1
Early 3.5-inch WD drives with Advanced Format supported jumper pins 7 – 8. Placing a jumper on these pins adjusted the drive’s internal alignment for single partition XP installations. Support for this jumper setting is no longer needed on newer drives. For optimal performance on all XP installations WD recommends running the WD Align utility.
If you have a drive that supports jumper pins 7 – 8 and have a jumper in place on those pins, the following is additional information to assist you if you are re-installing an Operating System or re-partitioning the drive:
IMPORTANT: You must backup your drive before making any changes, including removal of the jumper.
Re-partition the drive: Turn off power to the drive and remove the jumper from pins 7 – 8. Power-on and re-partition the drive (NOTE: All previous data on the drive will be lost).
Preserve Current Partition: If you are installing an Operating System over the existing partition, keep the jumper on pins 7 – 8. The drive is already aligned to the existing partition so you do not need to remove the jumper.
If you change the setting of jumper 7 – 8, you will lose all previous data and the drive must be re-partitioned.
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http://wdc.custhelp.com/app/answers/detail/a_id/5655
https://ata.wiki.kernel.org/index.php/ATA_4_KiB_sector_issues
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WD Advanced Format Jumper Setting
http://wdc-jp.custhelp.com/app/answers/detail/search/1/a_id/981#jumper
Advanced Format Drives - To achieve full performance on WindowsXP,single partition,Set Jumpers 7-8 prior to installation
Advanced Format
https://wiki.archlinux.org/index.php/Advanced_Format
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